Talk:Shear modulus

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Contents 1 Relation to Poisson's ratio and Young's modulus 2 Poisson's Ratio 3 Consistent shear modulus for rubber? 4 Strength or stiffness ?

[edit] Relation to Poisson's ratio and Young's modulus

Where the hell does this relationship come from. Surely its not an empirical formula! a derivation should be provided somewhere or at least an explination.

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--- the formula

should be added, here E is young's modulus, ν is poisson ratio which is usually 0.33.

This formula is the regular formula for G and can't be excluded in the article

I have just added this formula back. I see that it was removed, because it is present in a hidden table below the article. You have to click show to see this table. I'm convinced, that this formula should be in the main body of this article. And that hidden table is only for a reference - having all the formulas listed together. Janek Kozicki 14:07, 28 April 2007 (UTC)

The template for the relationsships has changed (Template:Elastic moduli) since the formulas were removed from this page. The template should be modified somewhat so that only the big table of formulas is hidden, not all of the templates content. When that happens, I think repeating a subset of the relevant formulas in this page is superflous. --Berland 21:13, 29 April 2007 (UTC)

[edit] Poisson's Ratio

Although the value of Poisson's Ratio is sometimes 0.33, it is in no way usually 0.33. It may be the case for a few materials, however, by no means is it the case in general. y?

Is the shear modulus for a fluid always exactly zero or just very close? Fornadan (t) 23:38, 5 November 2006 (UTC)

its zero for a hypothetical 'newtonian fluid' only, otherwise close to zero but it gets higher the more jelly like the fluid. Maybe this is worth a mention in the article?

[edit] Consistent shear modulus for rubber?

I was wondering if the specified shear modulus for rubber is correct? According to the wiki page on the elasticity modulus, E for rubber is typically between 0.01 and 0.1 GPa, which with Poisson's ratio = 0.5 would give G between ca 0.003 and 0.03 GPa? —The preceding unsigned comment was added by 62.247.4.34 (talk) 11:08, 28 March 2007 (UTC).

[edit] Strength or stiffness ?

In the "Explanation" it says that "The shear modulus is one of several quantities for measuring the strength of materials ..." but surely the word "strength" there should be replaced by "stiffness"? Fathead99 (talk) 14:14, 20 November 2007 (UTC)